Padlock



M. ELLISON Jan. 14, 1930.

PADLOCK Filed Feb. 2, 1929 3 Sheets-Sheet Inventor Jan. 14, 1930. M. ELLISON 1,743,331

PADLOCK Filed Feb. 2, 1929 3 Sheets-Sheet- 3 Patented Jan. 14, 1930 MOSES ELLISON, OF SALTVILLE, VIRGINIA PADLOGK Application filed February The present invention relates to improvements in padlocks and more particularly to a lock wherein the shackle is maintained in a locked position so that the same cannot be readily and easily picked to open the lock when the proper key is not at hand.

One of the important objects of the present invention is to provide a padlock that includes toothed tumblers that are actuated by a toothed key, said toothed tumblers cooperating with a pair of locking levers that normally have locking engagement with the locking shackle, the toothed key being further adapted to actuate an additional pair of locking elements so as to permit the looking shackle to be readily and easily disposed in an open position whenever desired.

A further object is to provide a padlock of the above mentioned character which will at all times be positive and efficient in its operation and simple in its construction.

Other objects and advantages of the invention will become apparent from the following description when taken in connection with the accompanying drawings.

In the accompanying drawings wherein like reference characters indicate corre sponding parts throughout the same:

Figure 1 is a sectional view through a casing of the padlock showing the normal po sition of the rotatable toothed tumblers and the locking members that cooperate with the notched arms of the shackle.

Figure 2, is a view similar to Figure 1 showing the parts in their actuated positions, after the toothed key has been inserted in the lock casing.

Figure 3 is a sectional view taken approximately on the line 33 of Figure 1.

Figure 4 is a transverse section taken approximately 011 the line 4-4 of Figure 1.

Figure 5 is a detail perspective view of the locking shackle.

Figure 6 is a similar view of one of the bell crank locking levers.

Figure 7 is a detail perspective view of one of the pivoted locking dogs.

Figure 8 is a perspective view of the lock casing, the cover plate therefor being re- 0 moved.

2, 1929. Serial No. 336,951.

F igure 9 is a detail perspective view of the cover plate for the look casing, and

Figure 10 is a detail perspective view of one of the rotatable toothed tumblers.

In the drawing wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates the substantially rectangular shaped pad-lock casing, the front side of which is open. A removable cover plate 2 is provided for the open front side of the casing and any appropriate fastening means such as is shown at 3 may be em-, ployed to detachably'secure the cover plate I in position over the open front side of the casing. The bottom of the casing is formed with an opening 4 through which the toothed key is insertible.

The top of the casing is formed with a raised apertured portion 5 through which extends one arm of the locking shackle 6, the other end of said locking shackle being adapted to extend through an. opening 7 formed in the adjacent end portion of the top wall of the casing. This top wall is further provided with an arcuate shaped slot 8 in its upper face and the slot intersects the opening 7 as clearly shown in Figure 8.

The purpose of this arcuate shaped slot will I be presently described.

The arms of the locking shackle are denoted by the reference characters 9 and 10, respectively, and each arm is formed at its free end portion with the diametrically opposed notches 11 and 12. The arm 9 is further formed with the outwardly projecting lugs 13 that prevent the displacement of this arm from the apertured enlarged portion 5 when the shackle is released or opened.

A pair of transversely disposed shafts 14 are journaled in suitable pairs of alined bear ings 15 and 16 respectively, that are associated.

with the rear closed side of the casing and the removable cover plate 2 for disposition on opposite sides of the slots 4 and secured on the intermediate portion of each shaft for rotation therewith is the toothed tumbler 17. The

construction of the tumbler and its supporting shaft. It will also'be observed that the teeth extend only partially around the circumference of each tumbler.

A pin 19 projects through each of the tumblers so that the ends of the pin extend beyond opposite faces of the tumbler and the portion of each pin that projects beyond the front face of the respective tumbler has connected thereto one end of a coil spring20 that is disposed axially around the respective shaft 14 and as is clearly shown in Figures 1, 2, and 3', the other end of the axial coil spring is connected to a stud 21 thatproj ects from the rear face of the cover plate 2. These axial coil springs maintain the rotatable toothed tumblers in their normal position shown in Figure 1.

The rear end portions of the pins 19 engage with suitable stop forming studs22 that project forwardly from the rear side of the casing 1 so that the rotation of the toothed tumblers is limited in one direction.

A pair of bell crank levers 23 are arranged 'for vertical swinging movement within the lock casing 1 'and a pivot pin 24 extends through the angular portion of each bell I crank lever, the ends of these studs or pins being supported in alined pairs of bosses 25 and 26, provided therefor on the rear side of the casing and the cover plate respectively.

The horizontally disposed arms of the bell crank levers are positioned adjacent theupper portions of the respective rotatable tum blers so that the pins 19 that project from the front side faces of the tumblers will engage with the bottom edges of the horizontal arms of the respective bell cranklevers to actuate the same as suggested in Figure 2.

A laterally disposed hook 27 is formed on the upper end of the vertical arm of each of the bell crank levers, and this hook is normally disposed in engagement with the outer notch 11 of the respective arms of the shackle z 6 by reason of the leaf spring 28.

The hooks 27 will hold theshackle 6 in' a retracted position against the tension of. the coil spring 29 that is interposed between the lower free end of the arm 9 and a bracket 30 that projects forwardly from the rear wall of the casing 1, it being understood of course that suitable projections are formed on the opposed faces of the end of the arm 9 and the bracket 30 around which the coil spring is disposed. I

For further locking the shackle in the retracted position, there is arranged within the casing a pair of opposed pivoted locking dogs 31 and 32, the same being mounted on transverse pins 33 that are supported at their ends within the respective pairs of bosses 34 and 35 associated with the rear side walls of the casing and the cover plate respectively. The upper end of each locking dog is formed with an outwardly projecting hook 36 that cooperates with the notch 12 formed in the respective arm of the shackle 6 and 'an expansible coil spring 37 is interposed between the locking dogs for normally urging the same apart into locking engagement with the notches 12 as suggested in Figure 1.

These locking dogs are formed at their lower ends with the downwardly converging fingers 38 and 39 respectively that terminate above the toothed tumblers and the extremside edges of the blade of the key for cooperation with the teeth 18 of the complementary toothed tumbler 17. v v

lVhen the parts are arranged as shown in Figure 1 it will be noted that the shackle 6 is locked in a retracted position by the hooked bell crank levers and the locking dogs. order to open the padlock, the proper key is inserted upwardly in the slot 4, and this key will pass between the toothed tumblers and the teeth 42 will engage with the teeth 18 of the respective tumblers to effect the rotation of said tumblers in opposite directions against the tension of the axial coil springs 20 so that the pins 19 w ll movemto "engagementwith the horizontal arms of the bell crank levers and the further rotation'of the toothed tumblers caused by the further upward movement of the key in the casing will result in the bell crank levers being rocked on their pivots to disengage thehooks 27 from the notches 11. a

At this time the nose 41 will have passed upwardy between the fingers 38 and 39 for.

actuating the same in an outward direction' whereupon to swing the locking dogs 31. and 32 inwardly toward each other so that the hooks 36 will become disengaged from the notches 12 and then the spring 29 will force the shackle 6 upwardly.

The free end of the arm 10 is then free to swing in the slot 8 away from'the casing to an open posltion.

By removing the key and pushing downwardly on the shackle 6 after the free end of the arm 10 has been disposed in the opening embodiment of my invention it is to be understood that minor changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention and scope of the appended claims.

' Having thus described the invention, what I claim as new and desire to secure by Letters Patent is 1. In a padlock, a casing, a shackle adapted to slide through the top of the casing, the arms of the shackle each being formed with a notch adjacent the free end thereof, hook shaped locking elements pivotally arranged in the casing and normally engaged with the respective notches to hold the shackle in a retracted position in the casing, spring means for holding the locking members in an operative position, key controlled means for moving the pivoted locking elements to an 1noperative position and unlock the shackle, said means including a pair of rotatable tumblers mounted in the casing, each tumbler being formed with teeth in its peripheral edge, and coacting means between the tumblers and the respective locking members for moving the latter to an inoperative position.

2. In a padlock, a casing, a shackle adapted to slide through the top of the casing, the arms of the shackle each being formed with a notch adjacent the free end thereof, hook shaped locking elements pivotally arranged in the casing and normally engaged wlth the respective notches to hold the shackle 1n a retracted position in the casing, sprlng means for holding the locking members in an operative position, key controlled means tor moving the pivoted locking elements to an operative position and unlock the shackle, said means including a pair of rotatable tumblers mounted in the casing, eacn tumbler being formed with teeth in its peripheral edge, and coacting means between the tumblers and the respective locking members for moving the latter to an inoperative position, and means for returning the rotatable tumblers to their normal position when the key is removed from the casing.

3. In a padlock, a casing, a shackle slidable through the top of the casing, the arms of the shackle being formed with notches adjacent their free ends, vertically disposed bell crank levers pivotally mounted in the casing, hooks formed on the free ends of the vertical arms of the bell crank levers for engagement with the notches of the respective arms of the shackle to hold said shackle in a retracted position, resilient means associated with the bell crank levers for normally holding the same in operative engagement with the notched arms of the shackle, key operated means for releasing the bell crank levers whereby to unlock the shackle, said means including a pair of rotatable toothed tumblers mounted in the casing adjacent the respective bell crank levers, and a pin projecting laterally *from each able through the top of the casing, the arms of the shackle being formed with notches adj acent their free ends, vertically disposed bell crank levers pivotally mounted in the casing, hooks formed on the tree ends'of the vertical arms of the bell crank levers for engagement with the notches of the respective arms of the shank to hold said shackle in a retracted position, resilient means associated with the bell crank levers for normally holding the same in operative engagement with the notched arms of the shackle, key operated means for releasing the bell crank levers whereby to unlock the shackle, said means including a pair of rotatable toothed tumblers mounted in the casing adjacent the respective bell crank levers, a pin projecting laterally from each toothed tumbler for engagement with the horizontal arm of the respective bell crank lever to move the same to an inoperative position, and means for returning. the

rotatable toothed tumblers to their normal positions when the key is removed. 1 l

5. In a padlock, a casing, a shackle slidable through the top of the casing, the arms of the shackle being formed with notches adjacent their free ends, vertically disposed bell crank levers pivotally mounted in the casing, hooks formed on the free ends of the vertical arms of the bell crank levers for engagement with l the notches of the respective arms of the shank to hold said shackle in a retracted position, resilient means associated with the bell crank levers for normally holding the same in operative engagement with the notched arms of the shackle, key operated means for releasing the bell crank levers whereby to unlock the shackle, said means including a pair of rotatable toothed tumblers mounted in the casing adjacent the respective bell crank levers, a pin projecting laterally from each toothed tumbler for engagement with the horizontal arm of the respective bell crank lever to move the same to an inoperative position, means for returning the rotatable toothed tumblers to their normal positions when thekey is 'removed, and additional pivoted locking dogs mounted in the casing for engagement with notches formed in the free end portions of the arms of the shackle, said locking dogs 1 being formed with downwardly converging fingers disposed in the path of the key for actuation thereby in a manner to move the locking dogs to an inoperative position.

In testimony whereof I affix my signature.

MOSES ELLISON. 

